... C level-low temperature and low pressure vessel pipe heat exchanger pipelineASTM A333A333 GR6steel pipe forhigh-pressure boilerUsed in manufacturing ... A53A53 BA106 Bsteel pipe for structureUsed in general structure, engineering scaffolds, mechanicalASTM A53A53 Bpipeline steel pipeUsed ... ,X60,X65,X70,X80ERW STEEL PIPEUsed in general structure stents, low voltage liquid transportation, etcGB/T13793- ...